McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
Chapters
| 1. |
Laser is used in LIDAR for what purpose? |
| A. | High-Speed Photography |
| B. | Range finder |
| C. | Optical Carrier signal |
| D. | Drilling |
| Answer» B. Range finder | |
| 2. |
A ________ is thermally sensitive resistor that exhibits a large change in resistance. |
| A. | Thermistor |
| B. | Resistance Thermometer |
| C. | Thermo couple |
| D. | Semiconductor based sensor |
| Answer» A. Thermistor | |
| 3. |
________ measures temperature by correlating the resistance of the RTD with temperature. |
| A. | Thermistor |
| B. | Resistance Thermometer |
| C. | Thermo couple |
| D. | Semiconductor based sensor |
| Answer» B. Resistance Thermometer | |
| 4. |
________ consists of two different metals connected at two points. |
| A. | Thermistor |
| B. | Resistance Thermometer |
| C. | Thermocouple |
| D. | Semiconductor based sensor |
| Answer» C. Thermocouple | |
| 5. |
Which type of temperature sensor is placed in Integrated Circuits? |
| A. | Thermistor |
| B. | Resistance Thermometer |
| C. | Thermocouple |
| D. | Semiconductor based sensor |
| Answer» D. Semiconductor based sensor | |
| 6. |
Which sensor is linear and low accuracy? |
| A. | Thermistor |
| B. | Resistance Thermometer |
| C. | Thermocouple |
| D. | Semiconductor based sensor |
| Answer» D. Semiconductor based sensor | |
| 7. |
Piezoelectric transducer is used for measuring __________ |
| A. | non-electrical quantities |
| B. | electrical quantities |
| C. | chemical quantities |
| D. | any quantity |
| Answer» A. non-electrical quantities | |
| 8. |
Piezoelectricity means _________________ |
| A. | Electric polarization |
| B. | Electric dielectric |
| C. | Pressure electricity |
| D. | Polar dielectric |
| Answer» C. Pressure electricity | |
| 9. |
What is the full form of LASER? |
| A. | Light Absorbent and Stimulated Emission of Radiations |
| B. | Light Absorbing Solar Energy Resource |
| C. | Light Amplification by Stimulated Emission of Radiations |
| D. | Light Amplification of Singular Emission of Radiations |
| Answer» C. Light Amplification by Stimulated Emission of Radiations | |
| 10. |
In Stimulated Absorption, what is the lifetime of atoms ground state? |
| A. | 1 second |
| B. | 1 minute |
| C. | 1 hour |
| D. | Infinity |
| Answer» D. Infinity | |
| 11. |
Which characteristic of LASER allows it to be used in holography? |
| A. | Coherency |
| B. | Directionality |
| C. | Intensity |
| D. | Monochromaticity |
| Answer» A. Coherency | |
| 12. |
Which of the following can be used for the generation of laser pulse? |
| A. | Ruby laser |
| B. | Carbon dioxide laser |
| C. | Helium neon laser |
| D. | Nd- YAG laser |
| Answer» D. Nd- YAG laser | |
| 13. |
Point out the wrong statement. |
| A. | MEMS stands for microelectromechanical systems |
| B. | MEMS as a class can be between 1000 and 100000 micrometers in size |
| C. | Several MEMS are packaged in smartphones |
| D. | All of the mentioned |
| Answer» B. MEMS as a class can be between 1000 and 100000 micrometers in size | |
| 14. |
Which of the following is not a configuration of a smart sensor? |
| A. | Transducer |
| B. | Network interface |
| C. | Processor |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 15. |
Input signal to smart sensor is fed from _____________ |
| A. | Power supply |
| B. | Transducer |
| C. | Volt meter |
| D. | All of the mentioned |
| Answer» B. Transducer | |
| 16. |
Signal conditioning is carried out in ______________ |
| A. | Transducer housing |
| B. | Processor |
| C. | Network interface |
| D. | None of the mentioned |
| Answer» A. Transducer housing | |
| 17. |
Output of smart sensors will of ________________ |
| A. | Analog |
| B. | Digital |
| C. | Analog and digital |
| D. | None of the mentioned |
| Answer» B. Digital | |
| 18. |
Which of the following defines smartness of sensor? |
| A. | Quality of data |
| B. | Circuit size |
| C. | Circuit components |
| D. | All of the mentioned |
| Answer» A. Quality of data | |
| 19. |
Input data of smart sensor will be _____________ |
| A. | Analog |
| B. | Digital |
| C. | Analog and digital |
| D. | None of the mentioned |
| Answer» A. Analog | |
| 20. |
LDR’s are also called _______________ |
| A. | Photo voltaic cell |
| B. | Photo resistive cell |
| C. | Photo emissive cell |
| D. | All of the mentioned |
| Answer» B. Photo resistive cell | |
| 21. |
Which of the following is not correct for fibre optic sensors? |
| A. | Immune to electro magnetic interference |
| B. | Immune to radiation hazard |
| C. | Can be used in harsh environments |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 22. |
Epoxy material in fibre optics is intended for ________________ |
| A. | Better optical properties |
| B. | Better reflection |
| C. | Better sealing |
| D. | Reducing noise |
| Answer» C. Better sealing | |
| 23. |
Optical fiber sensors are electrically ____________ |
| A. | active |
| B. | passive |
| C. | active as well as passive |
| D. | cannot be determined |
| Answer» B. passive | |
| 24. |
Optical fibers are not immune to ________ |
| A. | electronic disturbances |
| B. | magnetic disturbances |
| C. | ambient light interference |
| D. | electromagnetic disturbances |
| Answer» C. ambient light interference | |
| 25. |
In which of the following optic fiber sensor the fiber is simply used to carry light to and from an external optical device where the sensing takes place? |
| A. | extrinsic fiber optic sensor |
| B. | energized fiber optic sensor |
| C. | all fibers are used to simply carry light to and from the external optical devices |
| D. | intrinsic fiber optic sensor |
| Answer» A. extrinsic fiber optic sensor | |
| 26. |
Other name for tactile sensor is______________ |
| A. | Pressure sensor |
| B. | Humidity sensor |
| C. | Touch sensor |
| D. | Temperature sensor |
| Answer» C. Touch sensor | |
| 27. |
Which sensor is used in mobile phones? |
| A. | Capacitive touch sensor |
| B. | Temperature sensor |
| C. | Humidity sensor |
| D. | Weight sensor |
| Answer» A. Capacitive touch sensor | |
| 28. |
The nano particles from iron and palladium are used to produce ________ |
| A. | Magnets |
| B. | Magnetic lens |
| C. | Magneto meters |
| D. | Magnetic storage devices |
| Answer» D. Magnetic storage devices | |
| 29. |
Nano particles target the rare _______ causing cells and remove them from blood. |
| A. | Tumour |
| B. | Fever |
| C. | Infection |
| D. | Cold |
| Answer» A. Tumour | |
| 30. |
___________ is the field in which the nano particles are used with silica coated iron oxide iron oxide. |
| A. | Magnetic applications |
| B. | Electronics |
| C. | Medical diagnosis |
| D. | Structural and mechanical materials |
| Answer» C. Medical diagnosis | |
| 31. |
In which of the following categories be thin plate diaphragm included? |
| A. | Primary transducer |
| B. | Secondary transducer |
| C. | Voltage measuring devices |
| D. | Spring balance systems |
| Answer» A. Primary transducer | |
| 32. |
Which of the following applications are suited for thin plate diaphragms? |
| A. | Static pressure only |
| B. | Dynamic pressure only |
| C. | Both static and dynamic pressure with large frequency |
| D. | Both static and dynamic pressure with small frequency |
| Answer» D. Both static and dynamic pressure with small frequency | |
| 33. |
Which of the following devices convert pressure to displacement? |
| A. | Diaphragm |
| B. | Bellow |
| C. | Capsule |
| D. | Both diaphragm and capsule |
| Answer» D. Both diaphragm and capsule | |
| 34. |
Resistance temperature detector is ___________ |
| A. | a electrical tranducer |
| B. | a mechanical transducer |
| C. | a chemical transducer |
| D. | a physical transducer |
| Answer» A. a electrical tranducer | |
| 35. |
Relation between temperature and resistance of a conductor is ________ |
| A. | Rt = Rref [1+t] |
| B. | Rt = Rref [1+α∆t] |
| C. | Rt = Rref [1-αt] |
| D. | Rt = Rref [1-t] |
| Answer» B. Rt = Rref [1+α∆t] | |
| 36. |
Sensing element in the thermometer must provide ________ |
| A. | small change in resistance |
| B. | no change in resistance |
| C. | large change in resistance |
| D. | infinite change in resistance |
| Answer» C. large change in resistance | |
| 37. |
Resistive transducers are ______________ |
| A. | Primary transducers |
| B. | Secondary transducers |
| C. | Either primary or secondary |
| D. | None of the mentioned |
| Answer» C. Either primary or secondary | |
| 38. |
Which of the following can be used to measure using thermistors? |
| A. | Very low |
| B. | In-between 100Ω and 1MΩ |
| C. | Greater than 1MΩ |
| D. | None of the mentioned |
| Answer» B. In-between 100Ω and 1MΩ | |
| 39. |
Which of the following is correct for thermistors? |
| A. | Positive temperature coefficient of resistance |
| B. | Negative temperature coefficient of resistance |
| C. | Unpredictable temperature coefficient |
| D. | None of the mentioned |
| Answer» B. Negative temperature coefficient of resistance | |
| 40. |
Thermocouple is a ______________ |
| A. | Primary device |
| B. | Secondary transducer |
| C. | Tertiary transducer |
| D. | None of the mentioned |
| Answer» A. Primary device | |
| 41. |
Operation of thermocouple is governed by _______________ |
| A. | Peltier effect |
| B. | Seebeck effect |
| C. | Thomson effect |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 42. |
______________ describes current flow between two junctions formed by two different metals. |
| A. | Peltier effect |
| B. | Thomson effect |
| C. | Seebeck effect |
| D. | None of the mentioned |
| Answer» A. Peltier effect | |
| 43. |
Amount of heat liberated or absorbed when 1A current passes is called ____________ |
| A. | Thomson coefficient |
| B. | Peltier coefficient |
| C. | Seebeck coefficient |
| D. | None of the mentioned |
| Answer» B. Peltier coefficient | |
| 44. |
Thermo couple cannot be used to measure ____________ |
| A. | Temperature of gas |
| B. | Temperature of liquid |
| C. | IR radiation |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 45. |
Photoconductive transducers produce output ________ |
| A. | due to change in inductance |
| B. | due to change in light |
| C. | due to change in resistance |
| D. | due to change in temperature |
| Answer» C. due to change in resistance | |
| 46. |
Which of the following is correct for a level to force conversions? |
| A. | Liquid at constant density distribution |
| B. | Liquid with different density distribution |
| C. | Level difference should be gradual |
| D. | Liquid should be highly viscous |
| Answer» A. Liquid at constant density distribution | |
| 47. |
Which devices measures gases or liquid? |
| A. | Proximity sensor |
| B. | Pressure sensor |
| C. | Temperature sensor |
| D. | Touch sensor |
| Answer» B. Pressure sensor | |
| 48. |
Diaphragms in a pressure sensor are of ________ |
| A. | 2 types |
| B. | 5 types |
| C. | 10 types |
| D. | 20 types |
| Answer» A. 2 types | |
| 49. |
Thermocouples consist of a pair of wires made of dissimilar metals joined together at one or more junctions that generate a voltage when subjected to a temperature gradient . This phenomenon is known as the _________ |
| A. | Seebeck effect |
| B. | Piezolelectric effect |
| C. | Photovoltaic |
| D. | Photoconductor |
| Answer» A. Seebeck effect | |
| 50. |
What is the name of the question mark area? |
| A. | Measuring junction |
| B. | Bridge junction |
| C. | Temperature junction |
| D. | Compensating junction |
| Answer» A. Measuring junction | |
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